Geoege eichaeds



(No Model.) 3 Sheets-Sheet 1. G. RICHARDS.

GRINDING MACHINE.

No. 332,003. Patented Dec. 8, 1885.

(No Model.) 3 Sheets--Sheet 2.

3 G. RICHARDS.

GRINDING MAGHINE.

No. 332,003. Patented Dec. 8, 1885.

(No Model.) 3 S11eets-Sl1eet 3.

G. RICHARDS.

GRINDING MACHINE.

No. 332,003. Patented Dec. 8, 1885.

\ I lognpher. w

UNITED STATES PATENT Fries.

GRINDING- MACHINE.

SPECIFICATION forming part of Letters Patent No. 332,003, dated December8, 1885.

Application filed October 510, 1884. Serial No. 145,967.

To all whom it may concern:

Be it known that I, GEORGE RICHARDS, a

' citizen of the United States, residing at Manchester, England, haveinvented certain new and useful Improvements in Grinding-Machines; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

This invention relates to improvements in machines for grinding planerknives or cutters, and similar edge-tools.

The object of the invention is to diminish the liability of burning orinjuring the cutters by the rapid rotary movement of the emerywheel incontact therewith. This is accomplished by arranging the emery-wheel sothat its contact with the cutter will be only a hairline, and byimparting to said wheel while in rotation a constant side motion overthe work through the medium of a worm and wheel on the end of thedriving-shaft, and an eccentric link that connects with the frame inwhich the emery-wheel is supported. The knife-carrying table isreciprocated beneath the emerywheel by a steel cord that passes around asmall drum on a shaft that is actuated by appropriate gearing from themain driving-shaft. The rapid reciprocation of this table still furtherdiminishes the liability of burning the cutter. The table is driven ineither direction by means of two gears acting alternately on theopposite faces of a double-faced driving-gear, suitable reversing-leversbeing pro vided; or the reversing can be accomplished automatically bymeans of adjustable tappets on the table. The jar is relieved byaspring,against which the tappets strike; and my invention consists in suchpeculiar arrangement and combination of parts for securing the cutterfrom the danger of burning or marring while being ground, as will behereinafter specifically described, and set forth in the claims.

In the annexed drawings, illustrating theinvention, Figure 1 is a sideelevation of my improved grinding-machine. Fig. 2 is a top View of thesame. Fig. 3 is a vertical cross- (No model.)

section on the line a x of Fig. 1. Fig. 1 is an enlarged cross-sectionalview of the knifeholder and connections as shown in Fig. 3 on line a: a;of Fig. 1. Fig. 5 is a sectional detail illustrating the mechanism forimparting a laterally-reciprocating or sidewise movement to thegrinding-wheel. Fig. 6 is a section on the line y y of Fig. 5.

Like letters of reference are used to designate like parts throughoutthe several views.

The frame A of the machine is preferably in the form of a pedestal, andsupports a reciprocating table, B, that carries the knife or cutterholding devices. This table is actuated by means of a steel band or wirerope, a, connected to each end of the table, and passed centrally arounda small drum, 1), that is located in the upper part of the pedestal.Tension devices, consisting of a set-screw, c, or a pawl andratchetqvheel, 01, either or both, at opposite ends of the table, asshown in Fig. 1, are provided for regulating or adjusting the tension ofthe driving band or rope a. At one end of the shaft 6, that carries thedrum 1), is a large double-faced friction-gear, O, which is alternatelyrotated in opposite directions by means of the small friction-gears f g,that are j ournaled in a bracket, D, which is carried by a rock-shaft,E, projecting from the side of the machine, as shown in Figs. 2 and 3.The friction gears or pulleys f g are driven by belting from the maindriving-shaft F, as shown by dotted lines in Fig. 1.

On the opposite end of the rock-shaft E is a reversing-lever, G, bywhich the rock-shaft can be turned, so as to cause either the gear f orthe gear 5 to bear against the large gear 0. As one of these gears f gis arranged to bear against the periphery of the large friction-gear O,and the other is capable of bearing against its inner circumference, itwill be seen that by shifting the lever G the gear 0 and drum b can berotated in either direction at will.

In order to provide for an automatic reciprocation of the table B, apair of adjustable tappets, h h, are detachably secured to one of itssides, so as to come alternately in contact with the lever G, therebyshifting the same and producing, through the rock-shaft E,drum b, andtheir connections, a rapid automatic reciprocation of the table. Aspring, 2', is attached to the lever G, against which the tap petsstrike, thereby avoiding jar.

A counterbalance-lever, I-I, carrying a shiftable Weight, I, isfulcrumed at j, and is provided with a short arm, 70, having a beveledor wedge-shaped point or surface that is capable of engaging a similarsurface at the lower end of the lever G, as shown in Fig. 1, thusholding the gear f or the gear 9, as may be, in contact with the largefriction-gear O; or the gears f and 9 may both be held away from thelarge gear by causing the pointed surfaces of the lever G and arm 70 tocontact at their extreme ends. Thatthis can be done will be readilyapparent from a glance at Fig. 1, for it will be seen that these pointedsurfaces may be brought into contact by a slight displacement of lever Gand arm it from the positions therein shown, and such contact will bemaintained by means of the yielding pressure of the belting encirclingthe pulleys f and g and shaft F. It will be thus seen that the table Bis not only capable of a rapid automatically-reciprocating motion, butthat its movement can be reversed or stopped at will without interferingwith the action of other parts of the machine.

The surface of the reciprocating table B is hollowed or recessed, asshown in Fig. 3, for reception of an adjustable knife or cutter holdingdevice, J, of any suitable construction. This knife-holder J is pivotedor centered at m, Figs. 1, 3, and 4, in standards a n, carried by thetable, and is provided with adjusting screws or devices 10 p, by whichit can be arranged at any desired angle, according to the bevel. to begiven to the planer knife or cutter. The holder J also carries two ormore spring gages or guides, K, the construction of which is shown inFig. 4. It will be seen that by these gages the cutter-bar orplanerknife 2 can be quickly and accurately placed in position forgrinding. After the bar, cutter, or knife has been secured to the holderJ by means of set-screws s 8, passed through the usual slots in said baror cutter, the gages K K will be turned aside, so as not to interferewith the action of the grinding-wheel.

The frameA supports at one end standards L L, that afford bearings forthe main driving-shaft F, which carries pulleys M, and a driving-wheel,N, for actuating the grindingwheel 0, the latter being carried by aspindle or head-stock, I that is journaled in a movable frame, Q, whichis mounted near one end on the main drivingshaft. At one end of themovable frame Q, is a shiftable counterbalance-weight, .R, forregulating the pressnre of the emery-wheel 0 upon the edge of the toolor surface being ground. The other end of this movable frame Q isvertically adjustable by means of a screw, 1;, passing through theextremity of said frame and loosely supported at its lower end in astandard, S,which is connected to the main frame of the machine, asshown in Fig. 1. The frame Q, is provided with a slot or gap, at, Fig.2, in which the driving-wheel N rotates, and it alsohas a cap or hood,T, for covering the grindingwheel 0 and its head-stock or spindle P, asshown in Fig. 3.

It will be observed that the frame Q and the parts carried thereon havea slight lateral movement or reciprocation by means of asmall worm, r,and eccentric wheel to, at one end of the driving-shaft F, the eccentricwheel to being connected by means of links 0" r fixed portion of themachine-frame. A slight lateral reciprocation is thus imparted to theemery grinding-wheel 0 while being rotated over the surface of the work,and this movement of the grinding-wheel, in connection with to some 1its yielding pressure on the work and the rapid reciprocations of theknife-carrying table, reduces the chance of injuring the cutter.- bladesto a minimum, and at the same time results in producing a uniformcutting surface or edge.

By reference to Fig. 3 it will be seen that the head-stock or spindle P,that carries the grinding-wheel, is provided with conical journals thathave corresponding bearings in the lubricating-chambers U U, and withprovisions for adjusting the parts and compensating for wear as may berequired.

The operation and advantages of the machine will be readily understoodfrom the foregoing description, and need not be further explained.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a machine for grinding cutters or knives, the combination of thetable B, having adjustable knife-holder J and tappets h h, the drum 1),cord or band a, shaft 6, frictiongears O, f, and g, rock-shaft E, havinga bracket for supporting the small gears f g, the reversing-lever G,having a spring, t, the counterbalance-lever H, and means, substantiallyas described, for actuating the gears, whereby a rapidautomatically-reciprocating movement is imparted to the table,substantially as shown and set forth.

2. In a machine for grinding cutters or knives, the combination, withthe main driving-shaft F and the grinding-wheel O,mounted on a spindleor shaft, 1 that is actuated from said driving-shaft, of the movableframe Q, mounted on the main sh aft and having a counterbalance-Weight,R, adj listing-screw t, and a hood, T, substantially as described.

3. In a machine for grinding cutters or knives, the combination of themain frame A,

having standards L L, the main driving-shaft F, the movable frame Q,carrying the grind-- ing-wheel O, and means, substantially as described,for imparting a constant lateral movement to said grinding-wheel duringits rotation, substantially as described.

4. In a machine for grinding cutters or knives, the combination of themain frame A, movable frame Q, grinding-wheel O, mounted in said movableframe, driving-shaft F,worm

o, and eccentric wheel to, connected to the endv of said shaft, and thelinks 1' 9', whereby a latmounted in said movable frame, substantiallyeral reciprocation is imparted to the frame Q as described. and itsaccompaniments, substantially as de- In testimony whereof I affix mysignature in scribed. presence of two Witnesses. 5 5. In a machine forgrinding cutters or knives, the combination of the main frame A, GEORGERICHARDS reciprocating table B, knife-holder J, mounted Vitnesses:adjustably on said table, main driving-shaft F, ARTHUR C. HALL, havingpulleys M N and worm-gear c w, the ALBERT E. HALL,

is movable frame Q, and the grinding-wheel O, 9 Mount Street,Manchester.

